8.
When did the sun form?

9.
How long until the sun is a red giant?

Correct

Incorrect

1 billion years

Correct

Incorrect

4.5 billion years

Correct!

Wrong!

When it's around 7 billion years old, the sun's going to start expanding. When it reaches around 10 billion years old it'll have become a red giant whose atmosphere will reach almost as far as where Earth is right now. Eek.

15.
What type of star is the sun?

The sun's atmosphere is hotter than its surface. An earlier version of this quiz said that the sun's atmosphere was hotter than its core, which it clearly is not. You can all add one point to your scores, sorry!